81520040

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{291143}}^1$

素因数の和:291161

約数の個数: 32

約数和(自身を含む): 209623680

約数和(自身を除く): 128103640

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 291143, 582286, 1164572, 1455715, 2038001, 2329144, 2911430, 4076002, 5822860, 8152004, 10190005, 11645720, 16304008, 20380010, 40760020, 81520040]

約数ペア:

[(1, 81520040), (2, 40760020), (4, 20380010), (5, 16304008), (7, 11645720), (8, 10190005), (10, 8152004), (14, 5822860), (20, 4076002), (28, 2911430), (35, 2329144), (40, 2038001), (56, 1455715), (70, 1164572), (140, 582286), (280, 291143)]